﻿using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// The Basic Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234237

namespace Windows8AppsExample
{
    /// <summary>
    /// A basic page that provides characteristics common to most applications.
    /// </summary>
    public sealed partial class SimpleKeypad : Windows8AppsExample.Common.LayoutAwarePage
    {
        string inputString = "";
        char[] specialChars = { '*', '#' };

        public SimpleKeypad()
        {
            this.InitializeComponent();
        }

        /// <summary>
        /// Populates the page with content passed during navigation.  Any saved state is also
        /// provided when recreating a page from a prior session.
        /// </summary>
        /// <param name="navigationParameter">The parameter value passed to
        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
        /// </param>
        /// <param name="pageState">A dictionary of state preserved by this page during an earlier
        /// session.  This will be null the first time a page is visited.</param>
        protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
        {
        }

        /// <summary>
        /// Preserves state associated with this page in case the application is suspended or the
        /// page is discarded from the navigation cache.  Values must conform to the serialization
        /// requirements of <see cref="SuspensionManager.SessionState"/>.
        /// </summary>
        /// <param name="pageState">An empty dictionary to be populated with serializable state.</param>
        protected override void SaveState(Dictionary<String, Object> pageState)
        {
        }

        private void btnDelete_Click(object sender, RoutedEventArgs e)
        {
            inputString = inputString.Substring(0, inputString.Length - 1); 
            FormatText(); 
        }

        private void OnCharButtonClick(object sender, RoutedEventArgs e)
        {
            Button btn = sender as Button;
            inputString += btn.Content as string;
            FormatText();
        }

        private void FormatText()
        {
            bool hasNonNumbers = inputString.IndexOfAny(specialChars) != -1;
            if (hasNonNumbers || inputString.Length < 4 || inputString.Length > 10)
            {
                txtblkResult.Text = inputString;
            }
            else if (inputString.Length < 8)
            {
                txtblkResult.Text = String.Format("{0}-{1}",
                    inputString.Substring(0, 3),
                    inputString.Substring(3));
            }
            else
            {
                txtblkResult.Text = String.Format("({0}) {1}-{2}",
                    inputString.Substring(0, 3),
                    inputString.Substring(3, 3),
                    inputString.Substring(6));
            }
            btnDelete.IsEnabled = inputString.Length > 0;
        }
    }
}
